<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package    CodeIgniter
 * @author    EllisLab Dev Team
 * @copyright    Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright    Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license    http://opensource.org/licenses/MIT    MIT License
 * @link    http://codeigniter.com
 * @since    Version 2.1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CUBRID Forge Class
 *
 * @category    Database
 * @author        Esen Sagynov
 * @link        http://codeigniter.com/user_guide/database/
 */
class CI_DB_cubrid_forge extends CI_DB_forge {

    /**
     * CREATE DATABASE statement
     *
     * @var    string
     */
    protected $_create_database    = FALSE;

    /**
     * CREATE TABLE keys flag
     *
     * Whether table keys are created from within the
     * CREATE TABLE statement.
     *
     * @var    bool
     */
    protected $_create_table_keys    = TRUE;

    /**
     * DROP DATABASE statement
     *
     * @var    string
     */
    protected $_drop_database    = FALSE;

    /**
     * CREATE TABLE IF statement
     *
     * @var    string
     */
    protected $_create_table_if    = FALSE;

    /**
     * UNSIGNED support
     *
     * @var    array
     */
    protected $_unsigned        = array(
        'SHORT'        => 'INTEGER',
        'SMALLINT'    => 'INTEGER',
        'INT'        => 'BIGINT',
        'INTEGER'    => 'BIGINT',
        'BIGINT'    => 'NUMERIC',
        'FLOAT'        => 'DOUBLE',
        'REAL'        => 'DOUBLE'
    );

    // --------------------------------------------------------------------

    /**
     * ALTER TABLE
     *
     * @param    string    $alter_type    ALTER type
     * @param    string    $table        Table name
     * @param    mixed    $field        Column definition
     * @return    string|string[]
     */
    protected function _alter_table($alter_type, $table, $field)
    {
        if (in_array($alter_type, array('DROP', 'ADD'), TRUE))
        {
            return parent::_alter_table($alter_type, $table, $field);
        }

        $sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);
        $sqls = array();
        for ($i = 0, $c = count($field); $i < $c; $i++)
        {
            if ($field[$i]['_literal'] !== FALSE)
            {
                $sqls[] = $sql.' CHANGE '.$field[$i]['_literal'];
            }
            else
            {
                $alter_type = empty($field[$i]['new_name']) ? ' MODIFY ' : ' CHANGE ';
                $sqls[] = $sql.$alter_type.$this->_process_column($field[$i]);
            }
        }

        return $sqls;
    }

    // --------------------------------------------------------------------

    /**
     * Process column
     *
     * @param    array    $field
     * @return    string
     */
    protected function _process_column($field)
    {
        $extra_clause = isset($field['after'])
            ? ' AFTER '.$this->db->escape_identifiers($field['after']) : '';

        if (empty($extra_clause) && isset($field['first']) && $field['first'] === TRUE)
        {
            $extra_clause = ' FIRST';
        }

        return $this->db->escape_identifiers($field['name'])
            .(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
            .' '.$field['type'].$field['length']
            .$field['unsigned']
            .$field['null']
            .$field['default']
            .$field['auto_increment']
            .$field['unique']
            .$extra_clause;
    }

    // --------------------------------------------------------------------

    /**
     * Field attribute TYPE
     *
     * Performs a data type mapping between different databases.
     *
     * @param    array    &$attributes
     * @return    void
     */
    protected function _attr_type(&$attributes)
    {
        switch (strtoupper($attributes['TYPE']))
        {
            case 'TINYINT':
                $attributes['TYPE'] = 'SMALLINT';
                $attributes['UNSIGNED'] = FALSE;
                return;
            case 'MEDIUMINT':
                $attributes['TYPE'] = 'INTEGER';
                $attributes['UNSIGNED'] = FALSE;
                return;
            default: return;
        }
    }

    // --------------------------------------------------------------------

    /**
     * Process indexes
     *
     * @param    string    $table    (ignored)
     * @return    string
     */
    protected function _process_indexes($table)
    {
        $sql = '';

        for ($i = 0, $c = count($this->keys); $i < $c; $i++)
        {
            if (is_array($this->keys[$i]))
            {
                for ($i2 = 0, $c2 = count($this->keys[$i]); $i2 < $c2; $i2++)
                {
                    if ( ! isset($this->fields[$this->keys[$i][$i2]]))
                    {
                        unset($this->keys[$i][$i2]);
                        continue;
                    }
                }
            }
            elseif ( ! isset($this->fields[$this->keys[$i]]))
            {
                unset($this->keys[$i]);
                continue;
            }

            is_array($this->keys[$i]) OR $this->keys[$i] = array($this->keys[$i]);

            $sql .= ",\n\tKEY ".$this->db->escape_identifiers(implode('_', $this->keys[$i]))
                .' ('.implode(', ', $this->db->escape_identifiers($this->keys[$i])).')';
        }

        $this->keys = array();

        return $sql;
    }

}
